This does sound basic but have you ensured you have the latest
network drivers for your network card, this kind of problem
is typical of a driver bug.
Also windows will drop connections due to time-outs,

You may receive the following error message if the network disconnects
during certain network operations:

SYSTEM ERROR
Network Error on Drive <X>

When you receive this error message, clicking Cancel or Retry has no
effect. Pressing CTRL+ALT+DELETE also has no effect. You must turn the
computer off and back on, or press its reset switch, to restart the
computer.

STATUS
======

Microsoft has confirmed this to be a problem in Microsoft Windows 95. We
are researching this problem and will post new information here in the
Microsoft Knowledge Base as it becomes available.

MORE INFORMATION
================

Note that this problem does not occur when you are using a real-mode
Novell NetWare client such as NETX.

This error can be triggered by a program trying to access an open file
handle that has become invalid due to the network connection being lost.
If the program tries to access the handle a finite number of times,
clicking Cancel repeatedly will eventually return control to the program.
If the program tries to access the handle in an infinite loop, there is
no way to return control to the program or the system.

This error has also been reported to occur if a local, external hard disk
is disconnected or turned off while a program has files on the drive open.

Still, your basic problem lies with a loss of a network connection, which can be any number of things. You need to examine your network statistics to see if you are experiencing high numbers of collisions and retries. You could have a bad connector, or a physical segment of the network not up to spec. Other typical contributing problems are bad NICs, connections too close together, etc.

Also, user behaviours, such as powering a system off while it still has files locked on the server, etc.

Sometimes there is no magic silver bullet, even though the marketing literature makes such claims. Start by checking the basic health level of your network.

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